Assessing the adequacy of a protected area network in conserving a wide-ranging apex predator: The case for tiger (Panthera tigris) conservation in Bhutan

Protected area networks (PAN) are essential for conserving wide‐ranging apex predators but their adequacy in species protection has rarely been assessed. Here, we assess the adequacy of Bhutan's PAN in conserving and providing connectivity to the endangered tiger (Panthera tigris). We determine the current extent of tiger habitat, predict new suitable habitat, identify potential corridors, and empirically estimate the range of tiger numbers that Bhutan can spatially support. We use two spatial models with different approaches to ascertain current tiger distribution and predict new suitable tiger areas: (a) an expert model based on tiger ecology and (b) an observation model from observed tiger distribution. The expert model identified more suitable tiger areas (32,887 km2) over the observation model (29,962 km2), with the PAN encompassing 46% and 45% of predicted suitable areas, respectively. Vast suitable tiger habitat remains unprotected. Based on our estimates of total suitable habitats, Bhutan can spatially support 138–151 tigers compared to the current estimate of 103, thereby precluding a doubling in tiger numbers. To ensure adequate protection of tigers in Bhutan, we recommend readjusting and/or expanding existing PAN boundaries, including the designation of new corridors, protecting habitats, and conserving prey population

Annotated Checklist and Conservation Status of Mammal Species in Sarpang District, Bhutan

Bhutan has a total geographical area of 38,394 Km² located in between the Indo-Malayan and Palearctic region, out of which 51.44% (19750.75 km²) of its total geographical area has been designated as the protected area. However, none of the districts have a structured baseline checklist of mammal species documented till date. Therefore, Sarpang Forest Division under the Department of Forests and Park Services had carried out five rigorous camera trap surveys including a nationwide tiger survey that covers representable areas of the district from 2014 till 2020. The survey shows that district has 36 mammal species that belong to 18 families under seven orders. Felidae and Cervidae families has the highest species abundance (n = 17%), while, Canidae, Herpestidae, Leporidae, Manidae, Melinae, Muridae, Mustelidae, Tupaiidae, Proboscidae, Pteromyidae, Suidae and Ursidae were the lowest (n = 3%). Above all, Sarpang homed 29.90% of total mammal species of Bhutan, out of which 3% of mammal species were categorized under Critically Endangered, 14% Endangered, 14% Vulnerable, 22% Near Threatened, and 47% Least Concern as per IUCN Red List. However, only 20 mammal species are listed under CITES and nine in Schedule I of Forest and Nature Conservation Act of Bhutan, 1995. Therefore, landscape-based planning such as the Division-based Conservation & Management plan; periodic monitoring of wildlife species using camera traps, and validation of Schedule I species are suggested for long-term conservation and management of globally threatened species inside the landscape of Sarpang district in Bhutan

Corrigendum to “The ecological benefit of tigers (Panthera tigris) to farmers in reducing crop and livestock losses in the eastern Himalayas: Implications for conservation of large apex predators.” [Biological Conservation, 219,119-125]

Thinley et al. while acknowledging and giving due credence to the following study conducted in the same area: Wangchuk, T., 2004. Predator-prey dynamics: the role of predators in the control of problem species. J. Bhutan Stud. 10, 68-89., they inadvertently omitted further reference to the study which had similar findings. The authors would like to apologise for any inconvenience caused

High relative abundance of wild ungulates near agricultural croplands in a livestock-dominated landscape in Western Bhutan: Implications for crop damage and protection

There is little information on the underlying causes of wildlife crop damage, especially in agro-pastoralist communities situated close to, or inside, protected areas that are frequented by domestic livestock. Knowledge on wild ungulate distribution near crop field boundaries, and how it is affected by cattle that dominate the landscape, may offer insights into methods for reducing wildlife damage. In 2012, we investigated the distribution of three wild ungulates, sambar (Rusa unicolor), muntjac (Muntiacus muntjac), and wild pig (Sus scrofa), and domestic cattle (Bos taurus) in Jigme Dorji National Park, western Bhutan, at varying distances from croplands. At each of the 20 study villages, three transects were laid parallel to cropland boundaries at 500 m intervals. Transects were seasonally surveyed for wild ungulate and cattle scats, and scat frequency was used as a relative abundance index of wild ungulates and cattle. We also interviewed 111 household members from the 20 villages with crop fields situated near a forest edge, and recorded the seasonal frequency of crop damage. We used a generalized linear mixed model (GLMM) to evaluate how relative abundance of each ungulate species differed across transects and seasons. We also performed a one-way ANOVA to compare seasonal differences in frequency of crop damage, along with a simple linear regression to determine if there were significant relationships between crop damage frequency and relative ungulate abundance at transects situated closest to croplands. The relative abundance of wild herbivores was significantly higher in transects closest to croplands, and lower for transects located farther away in deep forests. An increased concentration of wild herbivores near agricultural fields during spring, which is the crop-growing period, explained the observed persistent damage to crops. Because of their very low overall densities in Bhutan, culling of wild herbivores is not recommended. Alternatively, cost-effective fencing methods for crop protection during spring are needed in the short term. In the long term, interdisciplinary solutions should involve enhancing the populations of natural predators, or habitat enrichment programs for ungulates, in concert with livestock intensification programs